Manufacturer and Distributor: The Boye Needle Company, Chicago, IL
GEM Trademark: US trademark 348,058 1934 GEM in script with quotes
GEM trademark: US trademark 141,804 1962 GEM in regular text, no quotes
Production: estimated 1933-1964
See article GEM Crochet Hooks
Top hook is older and nickel plated. Second hook is aluminum with no plating. Colored anodized (electroplated) hooks introduced in 1949.